JP3738141B2 - Variable oxygen enrichment burner - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a combustion burner, and more particularly to a variable oxygen enrichment burner that burns in a state enriched with oxygen.
[0002]
[Prior art]
Conventionally, oxygen-air mixing burners using oxygen-enriched air in which the partial pressure ratio of oxygen is changed have been provided to adjust the flame temperature and flame length. As a conventional oxygen-air mixed burner, a combustion-supporting gas in which oxygen is mixed with air and a fuel gas are introduced into a premixing chamber, and an air-fuel mixture gas mixed in the premixing chamber is ejected from a burner nozzle to a furnace. A combustion chamber such as a combustion chamber (see FIG. 4a), or a burner nozzle formed in an inner / outer double tube structure, fuel gas from the inner tube, and combustion-supporting gas in which oxygen and air are mixed from the outer tube. There are known those which are jetted into a combustion chamber such as a furnace, mixed at the tip of a burner nozzle and burned (see FIG. 4b).
[0003]
[Problems to be solved by the invention]
In an oxygen-air mixing burner in which fuel gas and combustion-supporting gas are introduced into the premixing chamber and the air-fuel mixture gas is ejected, the entire gas is introduced into the premixing chamber. If the oxygen enrichment rate is increased to 30% or more, the flame will fly under the influence of excess oxygen, so there is a problem that the enrichment rate is limited. Further, since the fuel and the combustion-supporting gas are mixed in the premixing chamber, a backfire occurs, but there is room for it.
[0004]
On the other hand, oxygen-air mixing burners with a double-pipe structure have a problem that oxygen and air are difficult to mix and the flame becomes unstable, and when trying to change the enrichment rate, the air is compared to the amount of ignition oxygen. Since the amount is overwhelmingly large, there is a problem that the change in the total flow rate of the combustion-supporting gas is large and the flow rate of the combustion-supporting gas becomes unstable. Further, since the combustion air and oxygen are premixed, there is a problem that the oil in the combustion air and oxygen come into contact with each other and start to burn in the mixing chamber.
[0005]
The present invention has been made paying attention to such points, and provides an oxygen enrichment variable burner capable of freely selecting an oxygen enrichment over a wide range and obtaining a stable flame. For the purpose.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention comprises a straight tubular inner and outer cylindrical bodies arranged concentrically, and a plurality of tubular bodies arranged in a state surrounding the inner cylindrical body in a space between the inner and outer cylindrical bodies. Formed in the fuel gas passage, the space between the inner and outer cylinders is configured as an air supply path, the inside of a plurality of tubes arranged in a state surrounding the inner cylinder is formed in the oxygen supply path, and the tip of the inner cylinder The tube is positioned inside the tip of the outer cylinder, and the tip of each tube forming the oxygen supply path is positioned inside the tip of the inner cylinder.
[0007]
[Effects of the Invention]
In the present invention, a burner is constituted by a straight tubular inner and outer cylinders arranged concentrically and a plurality of pipes arranged in a state surrounding the inner cylinder in a space between the inner and outer cylinders, and the inner cylinder is used as a fuel gas passage. Forming a space between the inner and outer cylinders in the air supply path, forming the interior of a plurality of tubes arranged in a state surrounding the inner cylinder in the oxygen supply path, and forming the tip of the inner cylinder as the outer cylinder Since the tip of each tube forming the oxygen supply path is located inside the tip of the inner cylinder, the oxygen is blown out into the air. The fuel gas such as propane gas is injected into this mixed combustion-supporting gas, and the flow rate of air, oxygen, and fuel can be individually controlled. The oxygen enrichment rate can be set freely. Thereby, the flame temperature can be set freely, and a flame having a stable length can be obtained.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The drawings show an embodiment of the present invention, and FIG. 1 is a central longitudinal sectional view.
The oxygen-enriched combustion burner includes an inner cylinder (1) that serves as a fuel gas supply passage for supplying liquefied petroleum gas fuel such as propane gas, and an inner cylinder (1) on the outer periphery of the inner cylinder (1) The outer cylinder (2) arranged concentrically with the inner cylinder (1) in the space (3) between the inner peripheral surface of the outer cylinder (2) and the outer peripheral surface of the inner cylinder (1) A plurality of tubes (4) arranged in a state of surrounding the inner cylinder (1) on a concentric circle centering on the axis of the inner tube, the inner and outer cylinders (1) (2), and each tube (4) are held. And a main body portion (5).
[0009]
The main body portion (5) includes a fuel introduction block (7) in which a fuel port (6) for supplying fuel gas is formed, an oxygen introduction block (9) in which an oxygen port (8) for supplying oxygen gas is formed, and a combustion And an air introduction block (11) having an air port (10) for supplying working air. The inner cylindrical body (1) serving as a fuel supply path is disposed so as to penetrate the air introduction block (11) and the oxygen introduction block (9) and is supported by both blocks (11) and (9). It is fixed. Each tubular body (4) serving as an oxygen gas passage is disposed in a state of penetrating the air introduction block (11), and is supported by the air introduction block (11) in a state in which it can be moved back and forth. The outer cylinder (2) is fixed to the front end surface portion of the air introduction block (11), and a space (3) formed between the outer cylinder (2) and the inner cylinder (1). The base end portion of this is open to face the air port (10). Accordingly, the space (3) formed between the outer cylinder (2) and the inner cylinder (1) serves as a supply path for combustion air. The outer cylinder (2) is a double pipe, and the inside of the double pipe is formed in the cooling water passage (12).
[0010]
The tip of the inner cylinder (1) is located inside the outer cylinder (2), and the tip of each tube (4) serving as an oxygen supply path is more than the tip of the inner cylinder (1). Furthermore, it is located inside. And the front-end | tip part of each pipe body (4) is formed in the nozzle (13). Each tube (4) serving as an oxygen supply path is supported by a holder (not shown) whose intermediate portion is fixed to the outer peripheral surface of the inner cylinder (1). (2) The combustion air supply passage (3) formed between them is formed in a shape that does not close.
[0011]
In the figure, reference numeral (14) is a fuel supply pipe connected to the fuel introduction block (7), (15) is an oxygen supply pipe connected to the oxygen introduction block (9), and (16) is connected to the air introduction block (11). It is a combustion air supply pipe, and each of the supply pipes (14), (15) and (16) is provided with a flow rate adjusting mechanism.
[0012]
When propane gas is used as the fuel, the oxygen concentration in the combustion air and the flame temperature have the relationship shown in FIG. 2, and the oxygen concentration in one combustion air and the flame length have the relationship shown in FIG. The flame length is shown as a ratio when the flame length is 100% when the oxygen concentration in the combustion air is 21% (atmospheric mixing ratio).
[0013]
In the oxygen enrichment variable burner configured as described above, the main body portion (5) is fixed to the furnace body or the like with the burner portion facing the furnace, and the oxygen enrichment is performed from a desired combustion temperature and a desired flame length. The oxygen is supplied from the oxygen supply pipe (15), the liquefied petroleum gas fuel such as propane from the fuel supply pipe (14), and the combustion air supply pipe (16 ) To supply the combustion air after the supply amount is adjusted in accordance with the increase or decrease of the oxygen enrichment rate.
[0014]
The oxygen gas, fuel gas, and combustion air supplied from each supply pipe (14), (15), and (16) are guided to the burner tip without being mixed in the middle, and are supplied individually until immediately before ignition. There will be no fire.
[0015]
【The invention's effect】
In the present invention, a burner is constituted by a straight tubular inner and outer cylinders arranged concentrically and a plurality of pipes arranged in a state surrounding the inner cylinder in a space between the inner and outer cylinders, and the inner cylinder is used as a fuel gas passage. Forming a space between the inner and outer cylinders in the air supply path, forming the interior of a plurality of tubes arranged in a state surrounding the inner cylinder in the oxygen supply path, and forming the tip of the inner cylinder as the outer cylinder Since the tip of each tube forming the oxygen supply path is located inside the tip of the inner cylinder, the oxygen is blown out into the air. The fuel gas such as propane gas is injected into this mixed combustion-supporting gas, and the flow rate of air, oxygen, and fuel can be individually controlled. The oxygen enrichment rate can be set freely. Thereby, the flame temperature can be set freely, and a flame having a stable length can be obtained.
[0016]
In addition, fuel gas, combustion air, and enrichment oxygen gas are separately supplied in the burner and ignited and burned immediately after mixing. It is extremely short and does not cause backfire.
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional view.
FIG. 2 is a graph showing a relationship between an oxygen enrichment rate and a combustion temperature.
FIG. 3 is a graph showing the relationship between the oxygen enrichment rate and the flame length.
4A and 4B are diagrams schematically showing a conventional oxygen-air mixing burner, in which FIG. 4A is an oxygen-air mixing burner having a premixing chamber structure, and FIG. 4B is an oxygen-air mixing burner having a double-pipe structure. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Inner cylinder, 2 ... Outer cylinder, 4 ... Tube, 3 ... Space between inner and outer cylinders.

Claims (2)

Concentrically arranged straight tubular inner and outer cylinders (1) and (2), and a plurality of tubes (4) arranged in a state surrounding the inner cylinder (1) in the space between the inner and outer cylinders (1) and (2). The inner cylinder (1) is formed in the fuel gas passage, the space (3) between the inner and outer cylinders (1) and (2) is formed as an air supply path, and surrounds the inner cylinder (1). The inside of the plurality of tubes (4) arranged in the above is formed in an oxygen supply path, the tip of the inner cylinder (1) is positioned inside the tip of the outer cylinder (2), and the oxygen supply path An oxygen enrichment variable burner in which the tip end of each tube (4) forming the tube is positioned inside the tip of the inner cylinder (1). 2. The oxygen enrichment variable burner according to claim 1, wherein a tip portion of each tubular body (4) arranged in a state surrounding the inner cylindrical body (1) is formed in a nozzle.

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